2nd October 2019

industrialnoisecontrol
18

How loud is 40 decibels?

Comparitive Examples of Noise Levels
Noise SourceDecibel LevelDecibel Effect
Library, bird calls (44 dB); lowest limit of urban ambient sound40One-eighth as loud as 70 dB.
Quiet rural area.30One-sixteenth as loud as 70 dB. Very Quiet.
Whisper, rustling leaves20
Breathing10Barely audible

What is the meaning of dB?

The decibel (dB) is an expression often used in electrical and acoustic measurements. The decibel is a number that represents a ratio of two values of a quantity such as voltage. It is actually a logarithmic ratio whose main purpose is to scale a large measurement range down to a much smaller and more useable range.
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